Interpretive Summary: Knowledge by practitioners regarding the potential impact of nickel nutritional physiology on pecan orchard profitability is a limiting factor in optimization of physiological efficiency of orchard enterprises. Knowledge by farmers and extension specialists about the role of nickel, a newly recognized micronutrient, is meager. This review summarizes situations where nickel influences key horticultural traits that influence tree and orchard yields and profitability. This information assists in recognition and correction of subtle forms of nickel deficiency in orchards, thus, helping to maximize profitability.

Technical Abstract:
Knowledge by practitioners regarding the potential impact of nickel nutritional physiology on pecan orchard profitability is a limiting factor in optimization of physiological efficiency of orchard enterprises. Knowledge by farmers and extension specialists about the role of nickel, a newly recognized micronutrient, is meager. This review summarizes situations where nickel influences key horticultural traits that influence tree and orchard yields and profitability. This information assists in recognition and correction of subtle forms of nickel deficiency in orchards, thus, helping to maximize profitability.